Detergent tablet



FIG. 1 is a perspective view of a detergent tablet, embodying our new design;

FIG. 2 is a top view thereof; the bottom view thereof being identical;

FIG. 3 is a side elevational view thereof; the other side view thereof being identical; and,

FIG. 4 is a front elevational view thereof; the back view thereof being identical. 

The ornamental design for a detergent tablet, as shown and described. 